Pulverizing apparatus.



W. K. LIGGETT.

PULVERlZING APPARATUS.

APPLICATION FILED APR. 9, 190B. RENEWED JUNE 17. 1915.

1,169,501 Patented Jan. 25, 1916.

Suva M 501,

wil'n @ooeo attorney To all whom it may concern:

. ran snares-Parana osrion WILLIAM E. LIGGETT, or COLUMBUS, OHIO,Assienofa 'ro THE JEFFREY MANUFAC- TUBING COMPANY, A CORPORATION. orOHIO. I

PULVERIZING APPARATUS.

Specification of Letters Patent.

- Patented Jan. 25, 1916.

Original application filed February 18, 1907, Serial No. 357,914.Divided and. this application filed April 9, 1908, Serial No. 425,150.Renewed June 17, 191 5. Serial No. 34,738

' Be it known that I, WIILIAM; K. Liocn'rr, a citizen of the UnitedStates, residing at Columbus, in the county of Franklin and State ofOhio, have invented certain hewand useful. Improvements in Pulvcrizing-Apl paratu's, of" which the following is a specification, referencebeing had therein to the accompanying drawing.

This invention relates to pulverizers, and has for its objects, first,to provide an improved hammer mechanism, and, secondly, to so constructthe rotatingparts that they act as a fan blower as well as to crush andpulverize the material.

. This application is a division of my ap- I plication, Sr. No. 357,914,filed Feb. 18, 1907.

In the drawings Figure 1 is a longitudi- 'nal section of an apparatusembodying my invention. Fig. 2 is a top plan view of the 7 same, Fig.3iis a vertical transverse sectional view looking toward the feedhopper.

In the drawings, the shaft 1 is shown mounted'in the bearings 2-2 andProvided with a pulley 3 which is adapted to be belted to. any suitablesource of power. The bearings 2 are carried by the base 4 which likewisesupports the casing 5. This casing is constructed in the usual mannerand is provided with the grinding plates 27 made of' material suitablefor the purpose of coacting 'with the hammers to grind the rock,

1 coal, ore or other material.

Material is fed into the casing from the feed plate 8 which is arrangedbelow the opening 6 in the feed hopper 7. The feed plate is reciprocatedon a track way by any suitable means, that shown comprising the' pitman9, crank 10, shaft 11 on which the cranlbis mounted, the latterreceiving its motion through suitable gearing 12-13, and the power shaft14, whicliis operatively connected to the shaft 1.

I have shown this pulverizeras connected to air inlet and outlet pipeswhich are de- -signed to lead to and from collecting and scribed andshown in the drawings are equally applicable to machines in wh ch .ingchamber through the material is removed from the pulverizgrate bars orin any other manner.

By means of the feeding mechanismabove described, a comparativelyair-tight inlet opening is, provided for the material, Air is drawn inthrough the central lateral openings in the casing 15-. 15, thelatterbeing connected to any desired source of air supply by means ofthe pipes 16-16 or to the collecting and separating devices to receiveinsufliciently pulverized material and return it to the pulverizer. Thedischarge opening .17 is preferably located atv the top of the mately ofthe same width as the pulverizing chamber, but the discharge duct 18widens rapidly above this opening in longitudinal planes, as shown inFig. 3, to form the enlarged chamber 19. In this chamber are mountedbafile plates 20 which serve to prevent the discharge of undesirablylarge pieces of material and to return them to'the pulverizing chamberto be more finely divided. Upon the shaft 1 are mounted incloseproximity to each other the annular disks 2121 having the annularpart 22' and the spokes 23. A chamber or passageway 26 is formed betweenthe annular. parts 22 and the spokes 23 of the disks. This chamber isconcentric with the axis and serves as a passageway for air as' well asfor material suspended in the air. Between these disksnare mountedhammers 24-24 which are pivotally carried by the rods 25, the latterbeing supported in the annular portions of the disks. These hammers areflat, metahbars, which between their ends are given a twist through anangle of between 45 and degrees. The bars are of such a width and aremounted at such a distance apart that when given this twist the bladeportions overlap each other. By constructing and mounting the hammers inthis centrifugal fans, and draw air in through the lateral openings 15,15, into the drumlike chamber 26 and radially outward against theperipheral walls of the casing. By giving the ends of the blades a twistthrough an angle of approximately 45 degrees, or such an angle that theblades are and rubbed in directions both transverse of vthe machine andcircumferentially. The

overlapping of the blades also prevents any part of the material frompassing between the hammers unground and facilitates the reduction ofthe material.

What I, claim is:

1. In apulverizing apparatus, the combi nation. of a casing havlng agrinding s ure face, a rotary horizontal shaft mounted in the casing, ahammer-carrying mechanism -mounted on the shaft and formed with achamber 26. concentric with the axis and open at both'ends, the chamberhaving radial openings at intervals throughout its length, a series ofhammers "mounted on the hammer-carrying mechanism, and adapted tocooperate with the said grinding surface,v

means in the planes of rotation of the hammers'for supplying to thecasing material to be pulverized, and means for feeding material to thesaid chamber 26 at both ends thereof,. the material fed to the chamber"passing out through the radial openings to be acted upon by the hammers.

2.' In a pulverizing apparatus, the combi-' nation of a casing, arotating pulverizing element mounted therein, arranged to act also as afan, a duct through which the material is carried along with the aircurrents produced by said rotating element, the duct and a deflector 2Osituated in the duct directly above and opposite the opening into thecasing and concaved downward to arrest the larger particlesof materialcarried out of the casing and ,to return them thereto through the saidduct, substantially as set forth.

two witnesses. WILLIAM K. LIGGET'I. Witnesses:

H. B. ALEXANDER, BEN GRAY.

In testimony whereof I affix my signature,

in presence of expanding immediately above the casing,-

